Welcome I can't update my watch because I reset my watch, so I get a problem that there is no update because you are not connected to the Internet I can't connect to the internet Thank you.
I want update my watch
iPhone XS Max, iOS 15
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The "Related article" above your question may help:
If you scroll down the article, you can see how to use your iPhone to update your watch.
(ie: The iPhone would supply the internet connection to do the update)